Which diagram correctly shows how heterozygous alleles are found on homologous chromosomes? A chromosome is labeled Upper A a.

A chromosome is labeled a a.

2 chromosomes are labeled Upper A and a.

2 chromosomes are labeled a and a.

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Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.

Dont understand the question